Well production management in sour environment at a surface equipment zone

Abstract

A sour production fluid mitigation system may be at an entry point below an injection sub for a coiled tubing system, pumping an inhibited fluid through pressure control equipment for the coiled tubing system to an exit point. A sour production fluid mitigation system may use a choke guide below the exit point and above a wellhead, maintaining an inhibited fluid pressure at the exit point greater than or equal to a production fluid pressure at a production tree of the wellhead.

What is claimed is: 
     
       1. A method of managing sour fluid at a surface equipment zone, the method comprising:
 at an entry point below an injection sub for a coiled tubing system, pumping an inhibited fluid through pressure control equipment for the coiled tubing system to an exit point; [and] using a choke guide below the exit point and above a wellhead, maintaining an inhibited fluid pressure at the exit point greater than or equal to a production fluid pressure at a production tree of the wellhead; 
 collecting the inhibited fluid from the exit point; 
 analyzing the inhibited fluid to identify a hydrogen sulfide concentration; and 
 when the hydrogen sulfide concentration is above a concentration threshold, increasing an inhibited flow rate of the inhibited fluid through the pressure control equipment. 
 
     
     
       2. The method of  claim 1 , wherein pumping the inhibited fluid includes pumping the inhibited fluid against a production flow of production fluids to the wellhead. 
     
     
       3. The method of  claim 1 , wherein maintaining the inhibited fluid pressure includes adjusting an inhibited flow rate of the inhibited fluid through the pressure control equipment. 
     
     
       4. The method of  claim 1 , wherein maintaining the inhibited fluid pressure includes maintaining a pressure differential between the inhibited fluid pressure and the production fluid pressure within a pressure threshold range. 
     
     
       5. The method of  claim 4 , wherein the pressure threshold range is between 50 psi and 100 psi. 
     
     
       6. A method of managing sour fluid at a surface equipment zone, the method comprising:
 measuring a production fluid pressure at a production tree of a wellhead; 
 measuring an inhibited fluid pressure at an exit point of the wellhead, the exit point located between pressure control equipment and the production tree; and 
 when a differential pressure between the inhibited fluid pressure and the production fluid pressure is below a low pressure threshold, flowing an inhibited fluid with an inhibited flow rate from an entry point to the exit point, the entry point located above the pressure control equipment and below an injection sub, wherein flowing the inhibited fluid increases the inhibited fluid pressure such that the differential pressure is equal to or greater than the low pressure threshold. 
 
     
     
       7. The method of  claim 6 , further comprising:
 collecting the inhibited fluid from the exit point; and 
 analyzing the inhibited fluid to identify a hydrogen sulfide concentration. 
 
     
     
       8. The method of  claim 7 , further comprising, when the hydrogen sulfide concentration is above a concentration threshold, increasing the inhibited flow rate of the inhibited fluid between the entry point and the exit point. 
     
     
       9. The method of  claim 6 , further comprising, when the differential pressure is greater than a high pressure threshold, reducing the inhibited flow rate of the inhibited fluid between the entry point and the exit point. 
     
     
       10. The method of  claim 9 , wherein the high pressure threshold is approximately 100 psi. 
     
     
       11. The method of  claim 6 , wherein flowing the inhibited fluid includes flowing the inhibited fluid with a second flow rate, and further comprising flowing the inhibited fluid with a first flow rate while measuring the production fluid pressure and the inhibited fluid pressure, and wherein flowing the inhibited fluid includes increasing the inhibited flow rate from the first flow rate to the second flow rate. 
     
     
       12. The method of  claim 6 , wherein the low pressure threshold is approximately 50 psi. 
     
     
       13. A wellhead stack for a coiled tubing system, the wellhead stack comprising:
 an entry point for insertion of an inhibited fluid; 
 an exit point below the entry point for collection of the inhibited fluid; and 
 a choke guide ram below the exit point, the choke guide ram including a choke ram having an inner diameter to pass coiled tubing of the coiled tubing system to therethrough, the choke guide ram configured to increase an inhibited fluid pressure of the inhibited fluid between the entry point and the exit point when the coiled tubing is within the choke ram. 
 
     
     
       14. The wellhead stack of  claim 13 , further comprising pressure control equipment between the entry point and the exit point. 
     
     
       15. The wellhead stack of  claim 13 , further comprising a stripper above the entry point. 
     
     
       16. The wellhead stack of  claim 13 , further comprising an injection sub above the entry point. 
     
     
       17. The wellhead stack of  claim 13 , further comprising:
 a production tree below the choke guide ram; 
 an exit pressure sensor at the exit point to measure an inhibited fluid pressure; and 
 a production pressure sensor at the production tree to measure a production pressure. 
 
     
     
       18. The wellhead stack of  claim 13 , further comprising an inhibited fluid pump in fluid communication with the entry point to pump the inhibited fluid between the entry point and the exit point.